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Measurement of two-particle semi-inclusive rapidity distributions at the CERN ISR

Иэмерение двухчастичных полуинклюэивных распределений на встречных накопительных кольцах в ЦЕРНе

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Il Nuovo Cimento A (1965-1970)

Summary

We present data on the semi-inclusive distributions of rapidities of secondary particles produced in pp collisions at very high energies. Our experiment was performed at the CERN Intersecting Storage Rings (ISR). The data given here, at centre-of-mass energies of √s=23 and 62 GeV, include the single-particle distributions and two-particle correlations. The semi-inclusive correlations show pronounced short-range correlation effects which have a width considerably narrower than in the case of inclusive correlations. We show that these short-range effects can be understood empirically in terms of three parameters whose energy and multiplicity dependence are studied. The data support the picture of multiparticle production in which clusters of small multiplicity and small dispersion are emitted with subsequent decay into hadrons.

Riassunto

Vengono presentati dati sulle distribuzioni inclusive in rapidità dei secondari carichi prodotti nelle collisioni protone-protone ad altissime energie. L’esperimento è stato eseguito agli Anelli ad Intersezione (ISR) del CERN. I dati, ad una energia √s=23 e 62 GeV nel centro di massa, comprendono le distribuzioni di particella singola e le correlazioni a due particelle per fissa molteplicità carica, come anche le correlazioni inclusive a due particelle. Le correlazioni semi inclusive mostrano forti effetti di correlazione a breve distanza, che hanno una larghezza molto più piccola che nel caso delle correlazioni inclusive. Nel lavoro si fa vedere che questi effetti a breve distanza possono essere capiti empiricamente in funzione di tre parametri di cui si studia la dipendenza dall’energia e dalla molteplicità. I dati favoriscono la descrizione della produzione a molti corpi in cui vengono emessi agglomerati di piccola molteplicità e piccola dispersione, che successivamente decadono in adroni.

Реэюме

В работе приводятся данные для полуинклюэивных распределений вторичных частиц, рожденных в рр соударениях при очень высоких знергиях. Нащ зксперимент был проиэведен на встречных накопительных кольцах в ЦЕРНе. Полученные в работе данные при знергиях в системе центра масс √s=23 и 62 ГзВ включают одночастичные распределения и двухчастичные корреляции при фиксированной множественности эаряженных частиц п, а также инклюэивные двухчастичные корреляции. Полуинклюэивные корреляции обнаруживают явно выраженные зффекты короткодействуюших корреляций, которые обладают щириной эначительно меньщей, чем в случае инклюэивных корреляций. Мы покаэываем, что зти короткодействуюшие зффекты могут быть общяснены змпрически в терминах трех параметров. Обсуждается эависимость зтих параметров от знергии и множественности. Полученные данные подтверждают картину множественного рождения, в которой испускаются кластеры с малой множественностью и малой дисперсией с последуюшим распадом в адроны.

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Author notes

  1. G. Bellettini

    Present address: Laboratori Nazionali del CNEN, Frascati

  2. C. Bradaschia & P. Giromini

    Present address: DESY, Hamburg

  3. T. Del Prete

    Present address: CERN, Geneva

  4. D. Green

    Present address: Carnegie-Mellon University, Pittsburgh, Pa.

  5. R. Thun

    Present address: University of Michigan, Ann Arbor, Mich.

Authors and Affiliations

  1. Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, Italy

    S. R. Amendolia, G. Bellettini, L. Bosisio, P. L. Braccini, C. Bradaschia, R. Castaldi, V. Cavasinni, C. Cerri, T. Del Prete, L. Foà, P. Giromini, P. Laurelli, A. Menzione, L. Ristori, G. Sanguinetti & M. Valdata

  2. Istituto di Fisica dell’Università, Pisa

    S. R. Amendolia, G. Bellettini, L. Bosisio, P. L. Braccini, C. Bradaschia, R. Castaldi, V. Cavasinni, C. Cerri, T. Del Prete, L. Foà, P. Giromini, P. Laurelli, A. Menzione, L. Ristori, G. Sanguinetti & M. Valdata

  3. Scuola Normale Superiore, Pisa

    S. R. Amendolia, G. Bellettini, L. Bosisio, P. L. Braccini, C. Bradaschia, R. Castaldi, V. Cavasinni, C. Cerri, T. Del Prete, L. Foà, P. Giromini, P. Laurelli, A. Menzione, L. Ristori, G. Sanguinetti & M. Valdata

  4. State University of New York, Stony Brook, N. Y.

    G. Finocchiaro, P. Grannis, D. Green, H. Jöstlein, R. Kephart & R. Thun

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  1. S. R. Amendolia
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  2. G. Bellettini
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Amendolia, S.R., Bellettini, G., Bosisio, L. et al. Measurement of two-particle semi-inclusive rapidity distributions at the CERN ISR. Nuov Cim A 31, 17–53 (1976). https://doi.org/10.1007/BF02729920

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